Twin packing nut



April Z7 1926. v 1,582,786

W. RHODES TWIN PACKING NUT- Filed July-2. 1*'925 y fgl,

' gaitented Apr. 27, 1926.

' out requiring UNITED STA v WILLIAM A. RHODES, OF BROOKLYN, NEW YORK.

TWIN PACKING NUT.

Application filed July 2,

To all whom it may concern:

' Be it known that I, WILLIAM A. RHODES, a citizen of the United States, and a resident of the city of New York, borough of B1 ooklyn, in the county of Kings' and State o't New York, United States of America, have invented a new and Improved Twin Packing Nut, of which the following is a full, clear, and exact description.

This invention relates to packings and similar devices such as stufiing boxes forming parts ef valves.

The prime object of the present invention is to provide means by virtue of which a packing operation may be carried out withthe closing of a valve whose leaky.coiiditionaieceasitates its being packed.

' -Anotheiebjeet of -vi'sionoa packing inl conjunction with extension of a valve casing permitting the .ntilization of a single packing,

the invention is the prodevice adapted for use the valve stem neck or and the provision 'of means by virtue of which an additional packing may be employed without reuiring the closing of the valve in the event t at the iirst packing has been materially aiiected by the pressure of the iuidto effectually prevent the escape of the fluid along l the valve stem.

Another object of the invention is the provision of a packing device which may be economically produced to lit valve stem necks of different types of valves, which will be simple of construction, readily applicable for use, and effectual 4for carrying out the results looked for.

With' the oregoing, other objects of the invention will appear from the embodiment et the invention, which lby way of example is described in the following specication and illustrated in the accompanying drawing, in which-- Figure 1 is aside elevation of a gate valve with the neck which surrounds the valve stem being broken away and showing the packing device of the present invention applied to said neck; the said packing device being shown 'in central vertical section.

Zalig. 2 is a transverse sectional viewI taken on the line 2-2 of Fig. 1.

Reierrin new more particularlyiitorthe views4 of t e drawing, vit will `be apparent v that, there has been shown a valve which but which must may be 'of any construction, necessarily include as formlng a part of the casing thereof ya neck or extension 11 which 'of the screw 4threade 1925. fSerial No. 41,153.

surrounds the stem 12 of the valve, and which is externally screw threaded as at 13. The said neck or extension 11, as is usu-al, is provided with a bore or recess 14 and a gland 15 through which the stem 12 extends.

In order to combine with the neck or extension 11 and its appurtenances to make prvision for the utilization ot two separate anddistinct paekings, there is provided the packing device 16 of the present invention presently to be described. The said packing device 16 comprises a unit 17 and a unit 18. The units are adapted to be detachably connected together, and the device in its entirety is then adapted to be detachably connected to the extension 11 by means to be described. The unit 17, in the present instance, comprises a section 19 which has a screw threaded bore 20, 'and a reduced sec.,-l tion 21 which is externally screw threaded as at 22. similarly to the bore 2() as to diameter and 21 also 'being provided with a bore or recess 23. The 'unit 17 is also Aformed to provide a gland 24 a portion of. which extends into pitch of threads, the said section u the bore and is of smaller diameter than said bore vt provide a space for the reception of the extremity of the neck or extension 11 when the unit 17 is applied theretol by virtue of the screw threads 13 of the extension 11 and the screw threads of the bore 20. The -unit 17 is provided with Hats for facilitating the application of the unit 17 by permitting the use of a wrench. The unit 18, in the present instance, is in the form of a cap nut and is provided with a screw threaded bore 25, and is also formed to provid a gland 26 adapted to fit within the bore or recess 23 ofthe unit 17 when the unit 18 is applied thereto. The diameter of the gland 26 is smaller than the diameter ofthe bore to provide a s ace for the reception end of the' reduced section 21 of the unit 17. The `unit 18is also-provided with flats for theI application of a wrench thereto to facilitate the connection and separation of the unit 18.

From the foregoing it 'will be apparent that when the 'packing device ofthe present invention is appliedto the neck orl extension 11' which surrounds the valve stem 12 there is provided two packing spaces .27

and 28. The packing space 27 is defined by f ing 29 Will suffice for a certain period of time for preventing leakage. However, in.

the event that the packing 29 no longer sufces for preventing leakage due to its having been materially alected, the s -ace 28 may be filled With a packing such as the packing 30 by removing the unit 18. The unit 18 may be removed after the-hand Wheel `H has been first removedJ The packing space 28 is defined by portions of the gland 24, gland 26, and section 2l. Attention is n ow called to the fact that While the packing 30 is being applied it is not necessary to close the valve since the packing 29 though inadequate to prevent leakage is nevertheless capable of preventing an outrush of the fluid. After the packing 30 has -site end thereof, the. end of said unit having the plain bore therein being externally screw threaded, the externally screw threaded end being equal in diameter to the diameter of the screw threaded bore and having l a similar thread, and a gland extending into` the screw threaded bore and bein of smaller diameter than said screw threa ed bore.

WILLIALLA. RHODES. 

